html,body{
    margin: 0;
    padding: 0;
    height: 100%;
}

html{
    background: linear-gradient(180deg, lightgreen, white);
}

.flex-row{
 display: flex;
 flex-direction: row;
 flex-wrap: wrap;
}

.flex-row-single{
    flex-wrap: nowrap;
}

.flex-center{
    justify-content: center;
    align-items: center;
}

.bg_red{
    background-color: red;
    color: white;
}

.bg_normal{
    background-color: white;
    color: black;
}